Actually, you know what? I'll take this one step farther. My swap isn't complete, so I will give you this:
My LS1/T56 swap into '68 Chevy C-10 stepside
http://ls1tech.com/forums/showthread.php?t=370781
This is a thread I've started at LS1tech.com forums. Go to post #5 and I have a freaking huge list of threads that will give you the information you need to pull this swap off. There should be enough there to get you by. If not, BOOKMARK THIS THREAD, come back and ask questions. Someone will chime in, believe me. People here have been an enormous help.
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If I've got anything up for grabs, it'll be here: 7-hole gauge cluster for a 67-72 p/u FREE (
link)
I can't check the forum daily. If I don't reply to you within 24 hours,
drop me a PM! I'm (hopefully) still alive and will reply faster to a PM.